The bombardment is part of the government's military offensive - which it began on June 19 - on the remaining opposition pockets in the southwestern region, which includes the Deraa and Quneitra provinces which straddle the border with Jordan and the frontier with the Israeli-occupied Golan Heights.
The regime now controls Daraa and its eastern outskirts, while its forces have been deployed along most of Syria's border with Jordan, in line with an earlier agreement between Russian Federation and Syrian armed opposition groups.
The war monitor said an estimated 1,400 people were expected to be evacuated in a single group on Sunday.
Rebel forces firing artillery less than 50 yards from the fence were seen in photographs said to have been taken from the Israeli side, as regime forces advanced to within a few miles.
Israel has said it will not allow any refugees to cross its border, trapping the fleeing people between the Israeli border and advancing regime forces.
In Daraa, the evacuation deal will hand over areas held by the rebels for years back to government control.
Israeli Prime Minister Benjamin Netanyahu has recently lobbied leaders of both Russian Federation and the United States to use leverage over Syria to prevent Iranian forces from entering the area once the regime reasserts control.
England won't hold back in play-off clash, insists Southgate
Belgium , meanwhile, have kept largely with their strongest team as manager Roberto Martinez aims to end the tournament on a high. Belgium bookended the game with goals from Thomas Meunier and Eden Hazard to achieve their best-ever result in the tournament.
Israel first started developing closer relations in 2015, when Russian Federation sent troops to Syria, prompting questions in Washington, D.C., about "why Netanyahu was "cozying up" to Putin at a time when Russian Federation was killing Syrian civilians and engaging in aggression against Ukraine".
"We receive orders from no one and our peaceful resistance will continue until our demands are met and the siege over Gaza is lifted", the group said.
Bolton, however, told ABC News on Sunday that the US was not going anywhere as long as Iran remained in Syria.
The Syrian government reached a reconciliation agreement Wednesday with rebels in Nawa, in southern Daraa province.
By controlling western Daraa's imposing mountaintops, the pro-government forces are effectively isolating rebel positions by using machine gun fire and artillery strikes to cut off the roadways connecting them, the commander added.
"We now are working on the logistical arrangements", said an Islamist rebel source familiar with the secret negotiations that Turkey was also involved in.
"We can do something to help people of Syria head in some form of shelter. both of us would be very interested in doing that", Trump said. Government fighters waved rifles and held aloft pictures of Assad as they celebrated on camera from the location, al-Haara hill.
On Sunday, Syrian state media reported on an airstrike against the T-4 airbase in the Homs countryside, attributing it to the Israeli Air Force.